Posted by: Rajivgandhi
Kindly advise me which value (0.72 or 0.001) is applicable. - 03/22/15 01:41 AM
Dear experts
I am new in crude oil pipeline stress analysis as per ASME 31.4 design code. We need some clarification from stress analysis experts.
Here my doubt is the Fac should be 1.0, 0.0, or 0.001. This value should be one for pipe under complete axial restraint. This value should be one when the pipe is fully restrained, such as buried for a long distance. The default value for Fac is 0.0. When Fac is 0.001, this indicates to CAESAR II that the pipe is buried but that the soil supports have been modeled. This causes the hoop stress component, rather than the longitudinal stress, to be added to the operating stresses if the axial stress is compressive.
B31.4 Chapter IX - F1, hoop stress design factor, according to Table A402.3.5(a) of B31.4. Appropriate values are 0.72 for pipelines or 0.60 for platform piping and risers.
As per 31.4 the design factor value is 0.72 and CAESAR II default value 0.001 for underground pipelines.
I have attached marked CAESAR II input entered location.
Kindly advise me which value (0.72 or 0.001) is applicable for crude oil pipeline stress analysis as per ASME 31.4 design code.
by
rajiv
I am new in crude oil pipeline stress analysis as per ASME 31.4 design code. We need some clarification from stress analysis experts.
Here my doubt is the Fac should be 1.0, 0.0, or 0.001. This value should be one for pipe under complete axial restraint. This value should be one when the pipe is fully restrained, such as buried for a long distance. The default value for Fac is 0.0. When Fac is 0.001, this indicates to CAESAR II that the pipe is buried but that the soil supports have been modeled. This causes the hoop stress component, rather than the longitudinal stress, to be added to the operating stresses if the axial stress is compressive.
B31.4 Chapter IX - F1, hoop stress design factor, according to Table A402.3.5(a) of B31.4. Appropriate values are 0.72 for pipelines or 0.60 for platform piping and risers.
As per 31.4 the design factor value is 0.72 and CAESAR II default value 0.001 for underground pipelines.
I have attached marked CAESAR II input entered location.
Kindly advise me which value (0.72 or 0.001) is applicable for crude oil pipeline stress analysis as per ASME 31.4 design code.
by
rajiv